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Server Failure

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Cloud infrastructure engineers examining server connectivity and service health monitoring during a Microsoft 365 outage

Cybersecurity & Website Security

What Caused the Microsoft Outage? November 2026 Investigation

By Umair Ali

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November 13, 2026

7 Min Read

What Caused the Microsoft Outage? Server Failures, Investigation, and Cyberattack Questions Microsoft’s investigation into the November 12–13, 2026 outage identified problems involving server availability and overwhelmed connection-handling…